func()

in proto/text_encode.go [261:352]
88 lines of code
23 McCabe index (conditional complexity)

func (w *textWriter) writeMessage(m protoreflect.Message) error {
	md := m.Descriptor()
	if w.expandAny && md.FullName() == "google.protobuf.Any" {
		if canExpand, err := w.writeProto3Any(m); canExpand {
			return err
		}
	}

	fds := md.Fields()
	for i := 0; i < fds.Len(); {
		fd := fds.Get(i)
		if od := fd.ContainingOneof(); od != nil {
			fd = m.WhichOneof(od)
			i += od.Fields().Len()
		} else {
			i++
		}
		if fd == nil || !m.Has(fd) {
			continue
		}

		switch {
		case fd.IsList():
			lv := m.Get(fd).List()
			for j := 0; j < lv.Len(); j++ {
				w.writeName(fd)
				v := lv.Get(j)
				if err := w.writeSingularValue(v, fd); err != nil {
					return err
				}
				w.WriteByte('\n')
			}
		case fd.IsMap():
			kfd := fd.MapKey()
			vfd := fd.MapValue()
			mv := m.Get(fd).Map()

			type entry struct{ key, val protoreflect.Value }
			var entries []entry
			mv.Range(func(k protoreflect.MapKey, v protoreflect.Value) bool {
				entries = append(entries, entry{k.Value(), v})
				return true
			})
			sort.Slice(entries, func(i, j int) bool {
				switch kfd.Kind() {
				case protoreflect.BoolKind:
					return !entries[i].key.Bool() && entries[j].key.Bool()
				case protoreflect.Int32Kind, protoreflect.Sint32Kind, protoreflect.Sfixed32Kind, protoreflect.Int64Kind, protoreflect.Sint64Kind, protoreflect.Sfixed64Kind:
					return entries[i].key.Int() < entries[j].key.Int()
				case protoreflect.Uint32Kind, protoreflect.Fixed32Kind, protoreflect.Uint64Kind, protoreflect.Fixed64Kind:
					return entries[i].key.Uint() < entries[j].key.Uint()
				case protoreflect.StringKind:
					return entries[i].key.String() < entries[j].key.String()
				default:
					panic("invalid kind")
				}
			})
			for _, entry := range entries {
				w.writeName(fd)
				w.WriteByte('<')
				if !w.compact {
					w.WriteByte('\n')
				}
				w.indent++
				w.writeName(kfd)
				if err := w.writeSingularValue(entry.key, kfd); err != nil {
					return err
				}
				w.WriteByte('\n')
				w.writeName(vfd)
				if err := w.writeSingularValue(entry.val, vfd); err != nil {
					return err
				}
				w.WriteByte('\n')
				w.indent--
				w.WriteByte('>')
				w.WriteByte('\n')
			}
		default:
			w.writeName(fd)
			if err := w.writeSingularValue(m.Get(fd), fd); err != nil {
				return err
			}
			w.WriteByte('\n')
		}
	}

	if b := m.GetUnknown(); len(b) > 0 {
		w.writeUnknownFields(b)
	}
	return w.writeExtensions(m)
}